There is absolutely no evidence that you can do anything to slow the progression of AD. None whatsoever. Exercise doesn’t help. Brain games don’t help. Going ketogenic makes fuck all difference.
If you ask on what basis I say this: my mother-in-law was diagnosed with MCI which developed into moderate AD (although it was cancer that killed her in the end). I am lucky to have a dear friend who is one of the most senior UK dementia physicians in the country. He was blunt when she was diagnosed. The best treatment we have produces a sub-clinical improvement in a single AD symptom, memory loss, but does not help with any others. And what does sub-clinical mean? It means that if you take these drugs at aged 75, by the time you get to age 80, your memory loss will the same as someone who was untreated was at 79.5. That’s detectable through memory tests but is not a functional improvement.
Don’t give yourself or others false hope. If someone you love is diagnosed with AD, enjoy your time with them as much as possible, get support and care as best you can, and don’t immiserate them or yourselves by forcing someone who is already losing emotional affect to eat a fucking keto diet and do fucking wordsearches.